錯誤信息
執行命令: sudo gem install sass時遇到下面的錯誤信息
Building native extensions. This could take a while...
ERROR: Error installing sass:
ERROR: Failed to build gem native extension.
current directory: /var/lib/gems/2.5.0/gems/ffi-1.11.1/ext/ffi_c
/usr/bin/ruby2.5 -r ./siteconf20190522-24821-9c6o4.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
extconf failed, exit code 1
Gem files will remain installed in /var/lib/gems/2.5.0/gems/ffi-1.11.1 for inspection.
Results logged to /var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/ffi-1.11.1/gem_make.out
解決
看了網上的一些解決方案，最后通過裝的完整ruby解決的。
原先安裝ruby用的命令是: sudo apt install ruby
改用命令sudo apt install ruby-full安裝ruby，然后再用命令sudo gem install sass成功安裝sass。
題外話：
更換gem的安裝源
//1.刪除原gem源
gem sources --remove https://rubygems.org/
//2.添加國內鏡像
gem source -a https://gems.ruby-china.com
//3.打印是否替換成功
gem sources -l
//4.更換成功后打印如下
*** CURRENT SOURCES ***
https://gems.ruby-china.com